Factors Resulting in Micron Indentation Hardness Descending in Indentation Tests

Conventional Vickers and true instrumented indentation hardness determined by instrumented indentation tests

We evaluate Vickers hardness and true instrumented indentation test (IIT) hardness of 24 metals over a wide range of mechanical properties using just IIT parameters by taking into account the real contact morphology beneath the Vickers indenter. Correlating the conventional Vickers hardness, indentation contact morphology, and IIT parameters for the 24 metals reveals relationships between conta...

Spherical Indentation Hardness of Shape Memory Alloys

FPGA based image acquisition and graphic interface for hardness tests by indentation

We present a real-time video and image acquisition system, which has important characteristics such as modularity, configurability, versatility, and low cost. This system was developed on the Altera DE2 Board ® using Verilog HDL ® (Hardware Description Language), VHDL ® (VHSIC Hardware Description Language) and Block Diagram as coding languages. The proposed system architecture was applied for ...

Indentation Hardness of the Bill Keratin of the European Starling’

DUFFY, D. C. 1989. Seabird foraging aggregations: a WANLESS, S., A. E. BURGER, AND M. P. HARRIS. 1991. comparison of two southern upwellings. Colon. Diving depths of shags Phalacrocorax aristoletis Waterbirds 12: 164-l 75. breeding on the Isle of May. Ibis 133:37-42. PIATT, J. F., AND D. N. NETTLESHIP. 1985. Diving WILSON, R. P. 1985. The Jackass Penguin (Sphendepths of four alcids. Auk 102:293...

On the Identification of Nonlinear Constitutive Laws from Indentation Tests

This paper addresses the identification of the parameters of a nonlinear constitutive law from indentation tests. The case of a standard generalized material without work hardening is extensively treated using the adjoint state method. This provides a general framework to perform optimization involving contact conditions and nonlinear material behaviour. A numerical identification is presented ...